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489849-78385 — INVERTED NUT,TUBE COUPLING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

489849-78385: INVERTED NUT,TUBE COUPLING.

The INVERTED NUT,TUBE COUPLING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 360, thread_size: 1/2-24, thread_class: 2A A, overall_length: 0.594 INCHES NOMINAL IN, style_designator: INVERTED NUT, TUBE, FLARE, thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-274-8113, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
489849-78385
NSN: 4730-00-274-8113
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 19422 — DEMARKUS CORP REFRIGERATION ENGINEERING CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY 360
thread_size1/2-24
thread_class2A A
overall_length0.594 INCHES NOMINAL IN
style_designatorINVERTED NUT, TUBE, FLARE
thread_directionRIGHT-HAND
seat_angle_in_deg0.063
width_across_flats0.500 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
smallest_inside_diameter0.321 INCHES MINIMUM AND 0.325 INCHES MAXIMUM IN
screw_thread_series_designatorUNS
material_document_and_classificationQQ-B-626, ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE
NSN4730-00-274-8113
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 489849-78385 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 0.063
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.313 INCHES NOMINAL IN
•
STYLE DESIGNATOR: INVERTED NUT, TUBE, FLARE
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-626, ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
SEAT ANGLE IN DEG0.063
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.313 INCHES NOMINAL IN
STYLE DESIGNATORINVERTED NUT, TUBE, FLARE
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-626, ALLOY 360 FED SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH0.594 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE1/2-24
SCREW THREAD SERIES DESIGNATORUNS
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 3
489849Reference document
Same NSN cross-reference
Reference document — Secondary reference
4730002748113Reference document
Same NSN cross-reference
Reference document — Secondary reference
8720791Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 489849-78385?
489849-78385 is a INVERTED NUT,TUBE COUPLING.
What parts can replace 489849-78385?
There are 3 known substitutes for 489849-78385: 489849, 4730002748113, 8720791. Substitute compatibility should be verified for your specific system.
What is the NSN for 489849-78385?
489849-78385 is cataloged in the U.S. Government catalog under NSN 4730-00-274-8113. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.